Table 2. Number and proportion of babies with BSI caused by clearly pathogenic organisms between 2010–2017 and rate ratios (representing monthly rate change) based on Poisson regression for BSI identified through deterministic + probabilistic linkage, deterministic linkage alone, clinical records of BSI in NNRD and any record of BSI (either from linkage or clinical record of BSI in NNRD).
| Number of babies with BSI A (%) | Monthly rate ratio (95% CI) |
Annual rate change | |||
|---|---|---|---|---|---|
| Whole period Jan 10-Jun 17 |
Early period Jul 10- Jun 11 |
Late period Jul 16- Jun 17 |
|||
| Deterministic and probabilistic links | 5,629 (1.6%) | 722 (1.7%) | 796 (1.5%) | 0.994 (0.987, 1.000)B | -7.5% (-14.3%, -0.1%) |
| Deterministic links | 5,011 (1.4%) | 589 (1.4%) | 750 (1.4%) | 0.996 (0.989, 1.003) | -4.9% (-12.4%, +3.1%) |
| Clinical record of BSI A | 3,277 (0.9%) | 285 (0.7%) | 450 (0.8%) | 0.998 (0.990, 1.007) | -1.8% (-10.9%, +8.2%) |
| Any record of BSI A | 7,081 (2.0%) | 860 (2.0%) | 1,000 (1.8%) | 0.994 (0.998, 1.000)C | -6.7% (-12.8%, -0.2%) |
| Total babies in NNRD | 349,740 | 42,205 | 54,279 | ||
A BSI = BSI caused by a clearly pathogenic organism with sample date between 7 days before admission and 14 days after discharge; based on admissions to 112 NICUs and LNUs;
B Upper limit of rate ratio is 0.9999188 therefore considered significant;
C Upper limit of rate ratio is 0.999865 therefore considered significant